268 lines
8.0 KiB
C
268 lines
8.0 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_sensor.h
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*
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* Include file for SDL sensor event handling
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*
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*/
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#ifndef SDL_sensor_h_
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#define SDL_sensor_h_
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#include "SDL_stdinc.h"
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#include "SDL_error.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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extern "C" {
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/* *INDENT-ON* */
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#endif
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/**
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* \brief SDL_sensor.h
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*
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* In order to use these functions, SDL_Init() must have been called
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* with the ::SDL_INIT_SENSOR flag. This causes SDL to scan the system
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* for sensors, and load appropriate drivers.
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*/
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struct _SDL_Sensor;
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typedef struct _SDL_Sensor SDL_Sensor;
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/**
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* This is a unique ID for a sensor for the time it is connected to the system,
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* and is never reused for the lifetime of the application.
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*
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* The ID value starts at 0 and increments from there. The value -1 is an invalid ID.
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*/
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typedef Sint32 SDL_SensorID;
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/* The different sensors defined by SDL
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*
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* Additional sensors may be available, using platform dependent semantics.
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*
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* Hare are the additional Android sensors:
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* https://developer.android.com/reference/android/hardware/SensorEvent.html#values
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*/
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typedef enum
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{
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SDL_SENSOR_INVALID = -1, /**< Returned for an invalid sensor */
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SDL_SENSOR_UNKNOWN, /**< Unknown sensor type */
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SDL_SENSOR_ACCEL, /**< Accelerometer */
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SDL_SENSOR_GYRO /**< Gyroscope */
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} SDL_SensorType;
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/**
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* Accelerometer sensor
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*
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* The accelerometer returns the current acceleration in SI meters per
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* second squared. This measurement includes the force of gravity, so
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* a device at rest will have an value of SDL_STANDARD_GRAVITY away
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* from the center of the earth.
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*
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* values[0]: Acceleration on the x axis
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* values[1]: Acceleration on the y axis
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* values[2]: Acceleration on the z axis
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*
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* For phones held in portrait mode and game controllers held in front of you,
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* the axes are defined as follows:
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* -X ... +X : left ... right
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* -Y ... +Y : bottom ... top
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* -Z ... +Z : farther ... closer
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*
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* The axis data is not changed when the phone is rotated.
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*
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* \sa SDL_GetDisplayOrientation()
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*/
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#define SDL_STANDARD_GRAVITY 9.80665f
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/**
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* Gyroscope sensor
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*
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* The gyroscope returns the current rate of rotation in radians per second.
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* The rotation is positive in the counter-clockwise direction. That is,
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* an observer looking from a positive location on one of the axes would
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* see positive rotation on that axis when it appeared to be rotating
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* counter-clockwise.
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*
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* values[0]: Angular speed around the x axis (pitch)
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* values[1]: Angular speed around the y axis (yaw)
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* values[2]: Angular speed around the z axis (roll)
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*
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* For phones held in portrait mode and game controllers held in front of you,
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* the axes are defined as follows:
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* -X ... +X : left ... right
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* -Y ... +Y : bottom ... top
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* -Z ... +Z : farther ... closer
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*
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* The axis data is not changed when the phone or controller is rotated.
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*
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* \sa SDL_GetDisplayOrientation()
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*/
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/* Function prototypes */
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/**
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* Locking for multi-threaded access to the sensor API
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*
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* If you are using the sensor API or handling events from multiple threads
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* you should use these locking functions to protect access to the sensors.
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*
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* In particular, you are guaranteed that the sensor list won't change, so
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* the API functions that take a sensor index will be valid, and sensor
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* events will not be delivered.
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*/
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extern DECLSPEC void SDLCALL SDL_LockSensors(void);
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extern DECLSPEC void SDLCALL SDL_UnlockSensors(void);
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/**
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* \brief Count the number of sensors attached to the system right now
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*/
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extern DECLSPEC int SDLCALL SDL_NumSensors(void);
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/**
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* \brief Get the implementation dependent name of a sensor.
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*
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* This can be called before any sensors are opened.
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*
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* \return The sensor name, or NULL if device_index is out of range.
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*/
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extern DECLSPEC const char *SDLCALL SDL_SensorGetDeviceName(int device_index);
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/**
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* \brief Get the type of a sensor.
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*
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* This can be called before any sensors are opened.
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*
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* \return The sensor type, or SDL_SENSOR_INVALID if device_index is out of range.
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*/
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extern DECLSPEC SDL_SensorType SDLCALL SDL_SensorGetDeviceType(int device_index);
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/**
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* \brief Get the platform dependent type of a sensor.
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*
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* This can be called before any sensors are opened.
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*
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* \return The sensor platform dependent type, or -1 if device_index is out of range.
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*/
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extern DECLSPEC int SDLCALL SDL_SensorGetDeviceNonPortableType(int device_index);
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/**
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* \brief Get the instance ID of a sensor.
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*
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* This can be called before any sensors are opened.
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*
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* \return The sensor instance ID, or -1 if device_index is out of range.
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*/
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extern DECLSPEC SDL_SensorID SDLCALL SDL_SensorGetDeviceInstanceID(int device_index);
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/**
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* \brief Open a sensor for use.
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*
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* The index passed as an argument refers to the N'th sensor on the system.
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*
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* \return A sensor identifier, or NULL if an error occurred.
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*/
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extern DECLSPEC SDL_Sensor *SDLCALL SDL_SensorOpen(int device_index);
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/**
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* Return the SDL_Sensor associated with an instance id.
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*/
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extern DECLSPEC SDL_Sensor *SDLCALL SDL_SensorFromInstanceID(SDL_SensorID instance_id);
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/**
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* \brief Get the implementation dependent name of a sensor.
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*
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* \return The sensor name, or NULL if the sensor is NULL.
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*/
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extern DECLSPEC const char *SDLCALL SDL_SensorGetName(SDL_Sensor *sensor);
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/**
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* \brief Get the type of a sensor.
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*
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* This can be called before any sensors are opened.
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*
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* \return The sensor type, or SDL_SENSOR_INVALID if the sensor is NULL.
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*/
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extern DECLSPEC SDL_SensorType SDLCALL SDL_SensorGetType(SDL_Sensor *sensor);
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/**
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* \brief Get the platform dependent type of a sensor.
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*
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* This can be called before any sensors are opened.
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*
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* \return The sensor platform dependent type, or -1 if the sensor is NULL.
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*/
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extern DECLSPEC int SDLCALL SDL_SensorGetNonPortableType(SDL_Sensor *sensor);
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/**
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* \brief Get the instance ID of a sensor.
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*
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* This can be called before any sensors are opened.
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*
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* \return The sensor instance ID, or -1 if the sensor is NULL.
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*/
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extern DECLSPEC SDL_SensorID SDLCALL SDL_SensorGetInstanceID(SDL_Sensor *sensor);
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/**
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* Get the current state of an opened sensor.
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*
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* The number of values and interpretation of the data is sensor dependent.
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*
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* \param sensor The sensor to query
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* \param data A pointer filled with the current sensor state
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* \param num_values The number of values to write to data
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*
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* \return 0 or -1 if an error occurred.
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*/
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extern DECLSPEC int SDLCALL SDL_SensorGetData(SDL_Sensor * sensor, float *data, int num_values);
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/**
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* Close a sensor previously opened with SDL_SensorOpen()
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*/
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extern DECLSPEC void SDLCALL SDL_SensorClose(SDL_Sensor * sensor);
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/**
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* Update the current state of the open sensors.
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*
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* This is called automatically by the event loop if sensor events are enabled.
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*
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* This needs to be called from the thread that initialized the sensor subsystem.
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*/
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extern DECLSPEC void SDLCALL SDL_SensorUpdate(void);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
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}
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/* *INDENT-ON* */
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#endif
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#include "close_code.h"
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#endif /* SDL_sensor_h_ */
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/* vi: set ts=4 sw=4 expandtab: */
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